1. Association between breastfeeding and intelligence, educational attainment, and income at 30 years of age: a prospective birth cohort study from Brazil 
Prof Cesar G Victora, PhD, Dr Bernardo Lessa Horta, PhD, Christian Loret de Mola, PhD, Luciana Quevedo, PhD, Ricardo Tavares Pinheiro, PhD, Denise P Gigante, PhD, Helen Gonçalves, PhD, Fernando C Barros, PhD 
The Lancet Global Health 
Volume 3, Issue 4, Pages e199-e205 (April 2015)
DOI: /S X(15)
Copyright © 2015 Victora et al. Open Access article distributed under the terms of CC BY Terms and Conditions

2. Figure 1
Association of mean IQ with breastfeeding duration, stratified by family income at birth
Estimates are adjusted for parental education, household score index, genomic ancestry, maternal smoking during pregnancy, maternal age, type of delivery, maternal body-mass index before pregnancy, gestational age, and birthweight.
The Lancet Global Health 2015 3, e199-e205DOI: ( /S X(15) )
Copyright © 2015 Victora et al. Open Access article distributed under the terms of CC BY Terms and Conditions

3. Figure 2
Direct acyclic graph of the effect of breastfeeding on monthly income at 30 years
NIE shows that 72% of the total effect of breastfeeding on income at 30 years (99 [95% CI 6·0–192·0]) is mediated by an individual's IQ and only 28% through NDE. We adjusted estimates for base confounders—family income at birth, parental education, household score index, genomic ancestry, maternal smoking during pregnancy, and birthweight—and educational attainment as a postconfounder. NIE=natural indirect effect. NDE=natural direct effect.
The Lancet Global Health 2015 3, e199-e205DOI: ( /S X(15) )
Copyright © 2015 Victora et al. Open Access article distributed under the terms of CC BY Terms and Conditions